Just keep doing stuff and after a couple days you'll be invited to drink by the monks, this gets you your first 10 sin.Am i missing something here? All options require at least 10 corruption, so i can't pick them. Guide tells me i need sin, but nothing i do gives sin.
The only thing i can think of to progress is checking the bathroom, but i went the authority route so i can't get in as i only have 11 trust.